Resumen: The upper part of the Higueruelas Formation (Lower Tithonian) exposed in an abandoned quarry near Mezalocha (northern Iberian Chain) allowed a detailed reconstruction of the facies architecture of the interior domain of an uppermost Jurassic carbonate platform. Fine-grained components (mostly peloids, rounded intraclasts and benthic foraminifers) are similar in all facies types. However, the distribution of coarse grains shows significant variation. In the more open facies (protected lagoon deposits) branching corals and large-sized irregular oncoids dominate clearly; in turn, in the more interior- shallower facies, stromatoporoids and serpulids, mainly in the form of large clasts or abraded fragments, are more abundant. This pattern of distribution seems to be related to different degree of adaptation of Upper Jurassic coral and stromatoporoid communities to changes in hydraulic conditions within the depositional environment.